Flower of the Deep Sleep

Yuuki has the ability to see the future. She also has a problem in that her sister has fallen asleep and seems unable to wake up. Then, to make matters worse, in one of her "visions" she sees a little girl and a friend of hers who then ends up sleeping like her sister.

Yuuki finds out she's not the only one with special abilities. The question is, can she use her abilities to change the future that she sees in her visions?

The story is extremely complex and very, very interesting. The only disappointing thing is that there are apparently only two volumes of the manga that are planned.